A firmware update was recently released for the NVR6XX-4KS2 series devices.
Information, instructions, and download links can be found Here
From Dahua Wiki
Can not playback the downloaded file.
- There is no media player.
- No DXB8.1 or higher graphic acceleration software.
- There is no DivX503Bundle.exe control when you play the file transformed to AVI via media player.
- No DivX503Bundle.exe or ffdshow-2004 1012 .exe in Windows XP OS.
- Download Dahua Smartplayer from dahuasecurity.com to play DAV file.
- You can get the Dahua Smartplayer from backing up videos into a USB.
- Use VLC media player.
Link to Dahua Smart Player (DAV File)
Link to VLC player for Windows and MAC.
Link for AVI media player